SMLJ24AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ24AE3/TR13 is an active-status transient voltage suppressor (TVS) diode manufactured by Microchip Technology, classified as a unidirectional Zener-type component in the DO-214AB (SMC) package. This device is designed for general-purpose transient voltage suppression applications requiring a 24V standoff voltage rating. Equivalent and substitute parts are necessary to address supply chain variability, inventory availability, and application-specific requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	26.7	V
Voltage - Clamping (Max) @ Ipp	38.9	V
Current - Peak Pulse (10/1000µs)	77.2	A
Power - Peak Pulse	300	W
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts are grouped based on the following electrical and mechanical substitution criteria:

Allowable Parameter Variations:

Voltage - Reverse Standoff: 24V (exact match required)
Voltage - Breakdown (Min): 26.7V (exact match required)
Voltage - Clamping (Max) @ Ipp: 38.9V ±0V (exact match required)
Current - Peak Pulse: Equivalent or greater peak pulse current
Power - Peak Pulse: Equivalent or greater power dissipation capability
Operating Temperature Range: Must encompass or exceed -55°C to 150°C
Package / Case: DO-214AB or SMC equivalent packages
Mounting Type: Surface Mount (required)
RoHS and Compliance: ROHS3 Compliant (required)

Parts are classified as Direct Substitutes when they match all voltage ratings and clamping specifications with compatible or superior current/power ratings. Parts are classified as Similar Alternatives when they share the voltage ratings and basic electrical characteristics but may differ in peak pulse current or power dissipation specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	V-Reverse Standoff	V-Breakdown (Min)	V-Clamp @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Temp Range	Package	Substitution Type
SMLJ24AE3/TR13	Microchip Technology	24V	26.7V	38.9V	77.2A	300W	-55 to 150°C	DO-214AB, SMC	Reference
3SMC24A TR13 PBFREE	Central Semiconductor Corp	24V	26.7V	38.9V	77.2A	3000W	-65 to 150°C	DO-214AB, SMC	Direct Substitute
SMLJ24A-TP	Micro Commercial Co	24V	26.7V	38.9V	77.2A	3000W	-55 to 175°C	DO-214AB, SMC	Direct Substitute
3.0SMCJ24A-13	Diodes Incorporated	24V	26.7V	38.9V	77.1A	3000W	-55 to 175°C	DO-214AB, SMC	Direct Substitute
3.0SMC24A	Littelfuse Inc.	24V	26.7V	51V	520A (8/20µs)	—	-65 to 150°C	DO-214AB, SMC	Similar Alternative
5.0SMDJ24A	Taiwan Semiconductor Corporation	24V	26.7V	38.9V	129A	5000W	-55 to 175°C	DO-214AB, SMC	Similar Alternative
5.0SMDJ24A-T7	Littelfuse Inc.	24V	26.7V	38.9V	129A	5000W	-65 to 150°C	DO-214AB, SMC	Similar Alternative
SMCJ24A-13-F	Diodes Incorporated	24V	26.7V	38.9V	38.6A	1500W	-55 to 150°C	DO-214AB, SMC	Similar Alternative

Engineering Selection Recommendations

Direct Substitutes (3SMC24A TR13 PBFREE, SMLJ24A-TP, 3.0SMCJ24A-13): These parts maintain all voltage specifications (24V standoff, 26.7V breakdown, 38.9V clamping) with peak pulse current ratings of 77.1A to 77.2A. All are ROHS3 compliant with MSL 1 classification. Selection between these three parts is determined by packaging format preference (tape & reel vs. cut tape) and operational temperature range extension (some variants support -55 to 175°C). These parts are electrically and mechanically interchangeable with the reference part.

Similar Alternatives (3.0SMC24A, 5.0SMDJ24A, 5.0SMDJ24A-T7, SMCJ24A-13-F): These parts share the 24V standoff and 26.7V breakdown voltages but vary in clamping voltage, peak pulse current, or power dissipation ratings. The 3.0SMC24A exhibits a higher clamping voltage (51V) and significantly higher peak pulse current (520A at 8/20µs pulse), making it suitable for applications requiring enhanced overvoltage suppression. The 5.0SMDJ24A and 5.0SMDJ24A-T7 provide substantially increased peak pulse current (129A) and power handling (5000W), appropriate for high-energy transient events. SMCJ24A-13-F provides reduced peak pulse current (38.6A) and moderate power dissipation (1500W). All are ROHS3 compliant. Selection of these alternatives requires application-specific verification of overvoltage tolerance and transient energy levels.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different peak pulse current rating? A: Peak pulse current capacity determines the maximum transient energy a TVS diode can suppress without degradation. Using a part with lower peak pulse current than required may result in device failure under high-energy transients. Using a part with higher peak pulse current provides design margin and is generally acceptable if clamping voltage and standoff voltage specifications are maintained.

Q: What is the significance of the clamping voltage specification? A: The clamping voltage (Vc @ Ipp) is the maximum voltage across the TVS diode during transient suppression. Parts with identical clamping voltages (38.9V) provide equivalent protection to downstream circuits. The 3.0SMC24A, with a 51V clamping voltage, will allow higher transient voltages to develop and is only suitable for applications tolerating this higher clamping level.

Q: Are tape & reel (TR) and cut tape (CT) packaging formats electrically equivalent? A: Yes. The difference between tape & reel and cut tape packaging is mechanical handling format only. The electrical characteristics and component specifications are identical. Selection is based on assembly line requirements and volume handling preferences.

Q: Is operating temperature range extension (e.g., -55 to 175°C vs. -55 to 150°C) a significant difference? A: Operating temperature range defines the environment in which the component maintains specified electrical performance. Extended upper temperature limits (-55 to 175°C) provide additional design margin for high-temperature applications. If your application operates within -55 to 150°C, both ranges are acceptable. Extended temperature capability does not negatively impact performance in lower-temperature applications.

Q: Do all substitute parts have the same RoHS and moisture sensitivity classification? A: All listed parts are ROHS3 compliant and carry MSL 1 (Unlimited) classification, indicating full compliance with hazardous substance restrictions and no moisture-related storage limitations. This uniformity ensures regulatory and reliability parity across all substitutes.

Q: What is the difference between direct substitutes and similar alternatives? A: Direct substitutes maintain all core electrical specifications—standoff voltage, breakdown voltage, clamping voltage, and peak pulse current—within equivalent ranges. Similar alternatives share the core voltage ratings but differ significantly in peak pulse current or power dissipation, requiring application-level verification before substitution.

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